JP3234398B2 - Steel pipe joint structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure of a steel pipe in which a steel pipe is connected using a joint member in a building, a steel tower, a pier, a marine jacket or the like using a steel pipe as a column member. is there.

[0002]

2. Description of the Related Art Conventionally, as a general joint structure of a steel pipe in a structure, there are (1) friction welding or flange joint using welding or high-strength bolts. These require a lot of labor and high quality control in the joint work. For the purpose of simplifying such a joint work, there is the following conventional technology. However, these are all joint structures using joint hardware. (2) 3-31605
The one disclosed in Japanese Patent Application Publication No. H10-15064 has a joint steel fitting previously joined to a steel pipe on one side to be joined, and the steel pipe on the other side is joined to this joint fitting mainly by bonding, so that it can be used on site. What reduced welding work. In addition, special fair 5
No. 25966 discloses a landslide prevention pile in which a steel pipe or a metal fitting for a joint is provided with a taper to join the steel pipe. Further, conventionally, as a means for connecting a steel pipe using a fitting metal fitting, it is also known to fill a gap of a joint portion with mortar or resin.

[0003]

Conventionally, in the case of steel pipe joining in a structure, as described in the above (1) and (2), a method using welding, high-strength bolts, or a method using joint hardware is used. All of these methods are structurally and completely fixed at each joint. Therefore, in the joint portion, the steel pipe and the steel pipe or between the steel pipe and the joint hardware are connected via a load transmitting object such as a weld metal, a bolt, concrete or resin. In the case of these conventional techniques, much labor and high quality control or bonding work are required in the joint work.

[0004]

In order to advantageously solve the above-mentioned problems, in the joint structure for steel pipes according to the present invention, opposed ends of three or more steel pipes 1 arranged vertically and connected to each other are provided. The upper and lower joint steel pipes 2 of the joint member 4 formed by fixing the flange 3 to the outer periphery of the intermediate portion of the joint steel pipe 2
Is inserted through the play gap. The present invention has a structure in which steel pipes are connected without using such other intervening objects (the objects transmitting the load described above). Therefore, the present invention is a mechanism in which some backlash occurs at the joining position. However, in the three-dimensional frame structure composed of the steel pipe members, since the effect of geometrically restraining the backlash can be obtained, the use performance (allowable displacement) as a structure using the steel pipe joint structure of the present invention is used. It is possible to secure.

[0005]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 2 shows a joint structure of a steel pipe according to an embodiment of the present invention, and FIG. 3 shows an exploded view of the joint structure of the steel pipe. A flange 3 made of steel is fixed by welding to form a steel joint member 4, and a lower steel pipe 1 fitted outside the lower part of the joint steel pipe 2 and an upper part fitted outside the upper part of the joint steel pipe 2 When the upper and lower ends of the joint steel pipe 2 are fitted to the respective steel pipes 1, a play gap is provided between the inner surface of the steel pipe 1 and the outer surface of the joint steel pipe 2. .

The outer diameter d of the joint steel pipe 2 in the joint member 4
Is set smaller than the inner diameter D of the upper and lower steel pipes 1, the thickness of the steel pipe 1 is t, the half of the difference between D and d is C / 2, and the flange 3 and the end face of the joint steel pipe 2 Distance of a
Then, by the external force acting in the direction perpendicular to the axis of the steel pipe 1,
Either rotation or parallel movement occurs in the joint. FIGS. 4 and 5 show a state before rattling occurs. 6 to 9 show the state after the backlash has occurred.
Assuming that the fitting length between the joint member 4 and the one steel pipe 1 is a and the wall thickness of the steel pipe 1 is t, the amount of rotation (per one joint) generated between the joint member 4 and the one steel pipe 1 (Inclination angle: θ)
Is represented by the following equation.

(Equation 1)

Next, a description will be given of comparative examples of the horizontal movement amount G at the column apex caused by the above-mentioned play in the three cases. FIGS. 10 to 18 show a case where the present invention is used for a column member composed of a steel pipe 1 of a structure (case 1: single column (FIGS. 10 to 12), case 2: a four-column rigid frame structure (FIG. 13). 15 to 15) and Case 3: Numerical formulas for calculating the horizontal movement amount at the column vertices due to backlash in the four-column rigid frame structure (FIGS. 16 to 18).

In the three cases shown in FIGS. 10 to 18, a = 1,000 mm, t = 25 mm, c = 10 mm
Table 1 shows the amount of horizontal movement G at the column apex when mm is set.

[Table 1]

FIGS. 1 and 16 to 18 show a four-column rigid frame structure 9 in the case 3 described above, in which a section steel pipe or a pipe or the like is formed over the adjacent steel pipes 1 at the same level. Horizontal connecting member 5 consisting of horizontal beams
In this example, a frame 6 with a steel pipe is fixed to the steel pipe 1 by welding, and the frame 6 with a steel pipe and the joint member 4 are alternately fitted.

The single column 7 of the case 1 shown in FIGS. 10 to 12 is an example in which the steel pipes 1 and the joint members 4 are alternately fitted in series.

In the case of the four-column rigid frame structure 8 of the case 2 shown in FIGS. 13 to 15, four horizontal connecting members 5 are connected to four adjacent relatively short steel pipes 1B by welding to form a frame with steel pipes. A frame 6 with a steel pipe and a joint member 4
This is an example in which steel pipes 1 and steel pipes 1 are sequentially fitted.

In the above embodiment, the case of a single pillar and the case of a four-post three-dimensional frame structure have been described. However, a two- or three-pillar three-dimensional frame structure or a multi-column structure of five or more pillars may be used. Alternatively, the horizontal connecting members 5 may be arranged and fixed diagonally or in any other direction with respect to the steel pipe 1 at the same level, and a plurality of horizontal connecting members 5 may be used to connect the steel pipes 1 to each other. May be fixed.

When assembling a structure by implementing the present invention, during the joining operation between the steel pipe 1 and the joint member 4,
The play between the joint member 4 and the steel pipe 1 may be temporarily fixed with a jig or the like at a fixed or arbitrary play width.

[0014]

According to the present invention, a joint is formed by fixing a flange 3 to an outer peripheral portion of an intermediate portion of a joint steel pipe 2 at opposed ends of three or more steel pipes 1 arranged in a longitudinal direction and connected to each other. Since the joint steel pipes 2 on the upper and lower sides of the member 4 are fitted through the play gaps, the displacement of the joint member can be controlled by regulating the size of the joint member and its manufacturing error. Therefore, according to the present invention, the labor, cost, and construction period can be significantly reduced as compared with the conventional technology, and stable quality can be obtained without being affected by the working environment or the skill.

[Brief description of the drawings]

FIG. 1 is a side view showing a four-column structure having a steel pipe joint structure according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional side view showing a joint structure of a steel pipe according to an embodiment of the present invention.

FIG. 3 is an exploded perspective view showing a joint structure of a steel pipe according to an embodiment of the present invention.

FIG. 4 is a longitudinal sectional side view showing a joint structure of a steel pipe according to an embodiment of the present invention.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a vertical sectional side view showing a state where an upper steel pipe is inclined with respect to a lower steel pipe.

FIG. 7 is a sectional view taken along the line BB of FIG. 6;

FIG. 8 is a longitudinal sectional side view showing a state in which an upper steel pipe has moved horizontally in a state parallel to a lower steel pipe.

FIG. 9 is a sectional view taken along the line CC of FIG. 8;

FIG. 10 is a side view showing a state in which a number of steel pipes lined up in a vertical direction are erected in a vertical state.

11 is a schematic explanatory diagram of a horizontal movement amount when an external force is applied in the case of FIG. 10;

FIG. 12 is an enlarged side view showing a part of FIG. 10;

FIG. 13 is a side view showing a four-post rigid frame structure.

FIG. 14 is a schematic explanatory view of a horizontal movement amount when an external force is applied in the case of FIG. 13;

FIG. 15 is an enlarged side view showing a part of FIG. 13;

FIG. 16 is a side view showing another example of a four-post rigid frame structure.

FIG. 17 is a schematic explanatory diagram of a horizontal movement amount when an external force is applied in the case of FIG. 16;

FIG. 18 is an enlarged side view showing a part of FIG. 16;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel pipe 2 Joint steel pipe 3 Flange 4 Joint member 5 Horizontal connection material 6 Frame with steel pipe 7 Single column 8 Four-column rigid frame structure 9 Four-column rigid frame structure

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F16B ^7/ 00-7/22 E04B 1/24 E04B 1/58

Claims (1)

(57) [Claims] 1. A device which is arranged vertically and connected to each other.
A joint structure of a steel pipe in which upper and lower joint steel pipes 2 of a joint member 4 configured by fixing a flange 3 to an outer peripheral portion of an intermediate portion of a joint steel pipe 2 at opposite ends of the steel pipe 1 or more are inserted through play.